System for tracking and responding to solar radiation exposure for improvement of athletic performance

ABSTRACT

One variation of a system for tracking and responding to Sun exposure includes: a housing configured to transiently attach to a port on a first garment; a jack coupled to the housing configured to transiently engage a port on the first garment; a radiation sensor arranged in the housing and configured to detect solar radiation incident on the housing; and a controller configured to: read an identifier of the first garment from the port via the jack; based on the identifier, estimate a skin exposure of a user wearing the first garment; read an solar radiation value from the radiation sensor at a first time; and, based on the solar radiation value and the skin exposure, estimate an solar radiation exposure of the user at the first time.

CROSS-REFERENCE TO RELATED APPLICATIONS

This Application claims the benefit of U.S. Provisional Application No.62/473,937, filed on 20 Mar. 2017, and U.S. Provisional Application No.62/473,940, filed on 20 Mar. 2017, both of which are incorporated intheir entireties by this reference.

This Application is also a continuation-in-part application of U.S.patent application Ser. No. 15/648,158, filed on 12 Jul. 2017, whichclaims the benefit of U.S. Provisional Application No. 62/361,414, filedon 12 Jul. 2016, U.S. Provisional Application No. 62/380,455, filed on28 Aug. 2016, U.S. Provisional Application No. 62/404,131, filed on 4Oct. 2016, and U.S. Provisional Application No. 62/434,184, filed on 14Dec. 2016, all of which are incorporated in their entireties by thisreference.

TECHNICAL FIELD

This invention relates generally to the field of sports medicine andmore specifically to a new and useful system for tracking and respondingto solar radiation exposure for improvement of athletic performance inthe field of sports medicine.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a flowchart representation of a system;

FIG. 2 is a schematic representation of one variation of the system;

FIG. 3 is a flowchart representation of one variation of the system; and

FIG. 4 is a flowchart representation of one variation of the system;

FIGS. 5A and 5B are graphical representations of variations of thesystem; and

FIG. 6 is a flowchart representation of one variation of the method.

DESCRIPTION OF THE EMBODIMENTS

The following description of embodiments of the invention is notintended to limit the invention to these embodiments but rather toenable a person skilled in the art to make and use this invention.Variations, configurations, implementations, example implementations,and examples described herein are optional and are not exclusive to thevariations, configurations, implementations, example implementations,and examples they describe. The invention described herein can includeany and all permutations of these variations, configurations,implementations, example implementations, and examples.

1. System

As shown in FIGS. 1 and 2, a system 100 for tracking and responding toSun exposure for improvement of athletic performance includes: a housing112 configured to transiently attach to a port 124 on a garment 150; ajack 114 coupled to the housing 112 configured to transiently engage aport 124 on the garment 150; a radiation sensor 116 arranged in thehousing 112 and configured to detect one or more wavelength bands ofsolar radiation incident on the housing 112; and a controller 130configured to: read an identifier of the garment 150 from the port 124via the jack 114; based on the identifier, estimate a skin exposure of auser wearing the garment 150; read a solar radiation value from theradiation sensor 116 at a first time; and, based on the solar radiationvalue and the skin exposure, estimate a solar radiation exposure(defined herein as ultraviolet, visible and/or infrared electromagneticradiation exposure) of the user at the first time.

In one variation of the system, the controller 130 can also beconfigured to serve a prompt to the user to reduce solar radiationexposure in response to an estimated level of solar radiation exposureon the user's skin exceeding a threshold value.

1.1 Applications

The system 100 includes a garment 150 and an exposure-tracking module110 that cooperate to form a “smart garment” configured to track solarradiation exposure at one known location on the garment 150. The system100 also includes an identification module integrated into the garment150 and configured to communicate various data to the exposure-trackingmodule 110 when the exposure-tracking module no is connected to a port124 on the garment 150. A software program—such as executing at a remoteserver or locally by the controller 130 of the exposure-tracking module110—can then access skin coverage afforded by the garment 150, solarradiation deflection properties of the garment's material, ambientreflectance of a ground surface common to a type of outdoor activityassociated with the garment 150, a location of the port 124 on thegarment 150, use and exposure history, and/or various othergarment-related data. The software program can then merge thesegarment-related data with solar radiation (e.g., UV-A, UV-B, UV-C,visible light, and/or infrared light) exposure detected by theexposure-tracking module 110 at one instant in time to estimate a solarradiation exposure on a user's skin at a specific instant in time. Byintegrating this total solar radiation exposure over a duration of atraining session (or a competition), the computer system 100 can trackthe user's total solar radiation exposure throughout this period of timeand provide guidance to the user for managing her Sun exposure, such asby serving a prompt to the user's smartphone or smartwatch to applySunscreen, seek shade, postpone outdoor activity, and/or add layers ofclothing and protective gear (such as sunglasses, hats, etc.) to covermore skin.

Generally, human performance in sport and athletics may be impacted bysolar radiation exposure, as shown in FIGS. 5A and 5B. For example,excess sun exposure may increase an athlete's skin temperature and/ortrigger other processes in the athlete's body that reduce the athlete'sshort-term (e.g., immediate) time to exhaustion, power output, andoverall performance during a current training session or competition.Excess Sun exposure may also extend the athlete's recovery time afterexertion, yielding reduced performance during a next practice session orupcoming competition. Excess Sun exposure may also yield heat rash andSunburn that negatively affect the athlete's future mobility andadversely affect the athlete's immediate performance and long-termhealth through other mechanisms. In particular, when regularly engagingin an outdoor sport—such as running, cycling, football, baseball,soccer, field hockey, lacrosse, cross country skiing, canoeing,kayaking, swimming, golf, and tennis—an athlete may be exposed tosufficient Sunlight to maintain healthy levels of vitamin D, which mayyield higher bone density, improved athletic performance, reduced injuryrisk, and improved muscle recovery in the mid- to long-terms. However,over-exposure to Sunlight may yield immediate decreases in the athlete'sperformance (e.g., during practice and during competition), such as inthe form of reduced power output and reduced endurance.

The system 100 can therefore include: a smart garment 150 configured tomonitor incident solar radiation at one point or one limited area over auser during a training or competition session. The system 100 cantransform incident solar radiation (e.g., UV light, visible light,and/or infrared light) data and known parameters of the smart garment150 into a measurement of total exposure across the user's body. Basedon this measurement of total solar radiation exposure for the user,including direct, diffuse and reflected radiation exposure, theconfiguration and material of the garment 150, reflectivity of ambientsurfaces common to an associated sport (e.g., grass for soccer, turf forfootball, asphalt for cycling, snow for skiing, etc.), and the locationof the exposure-tracking module 110 on the garment 150, the system 100can provide real-time, predictive guidance to the user (or to the user'scoach, parent, etc.) for managing subsequent sun exposure during thesession to improve or maintain the user's performance.

The system 100 is described below as including: a garment 150, such as ashirt or jersey, worn by a user; an exposure-tracking module 110transiently installed on the garment 150, collecting garment 150identification and solar radiation exposure data, and wirelesslytransmitting these data to a local smartphone, smartwatch, or othermobile computing device nearby. The system 100 can cooperate with aremote name mapping system (“NMS”) to link the garment's identifier togarment-related data. The system 100 can also execute a softwarepackage, which a mobile computing device of the user can execute. Thesoftware package can be configured to: retrieve garment-related-datafrom the NMS; process garment 150 identification and solar radiationexposure data locally and substantially in real-time; and selectivelyreturn notifications to the user or to the user's coach. However, theexposure-tracking module 110 can alternatively transmit the foregoingdata to a remote server, such as via a local mobile computing device orhub; and the software package can execute on the remote server. Yetalternatively, the identification module integrated into the garment 150can store various garment-related data, such as garment 150configuration, solar rejection properties (i.e. absorption and/orreflection of one or more bands or solar radiation), reflectivity ofambient surfaces common to an activity associated with the garment 150,etc., and can return these data to the exposure-tracking module 110 whenconnected to the garment 150 before or during a session; and theexposure-tracking module 110 can execute the software program locally totrack the user's ultraviolet exposure during the session and toautomatically communicate prompts to a local mobile computing deviceaffiliated with the user (or the user's coach, parent, etc.). However,elements of the system 100 can be of any other form and packaged in anyother way to collect and process solar radiation data during a user'straining session.

1.2 Garment

The system 100 includes a garment 150 configured to be worn by a user.For example, the garment 150 can include: short-sleeved, long-sleeved,or sleeveless soccer, baseball, football, running, cycling, golf,lacrosse, or tennis jersey; a skiing coat; athletic shorts; a footballor cycling helmet; a baseball cap; a swimming suit; or any other soft orhard garment 150 configured to cover a region of a user's body whenworn.

In one variation, elements of the system 100 are integrated into a skipole, a ski, a bicycle frame or component, a backpack, a hydration pack,a shoe, a flotation vest, a helmet, a hat, a wrist band, or other sport-or activity-related object; and the software program implements methodsand techniques to identify the object, track ultraviolet exposure viasensors in the exposure-tracking module 110 connected to the object, andto serve Sun exposure-related guidance to the user.

1.3 Port and Identification Module

The system 100 also includes a port 124 arranged on the garment 150 andan identification module configured to communicate garment-related data(e.g., type, thickness, transmittance of solar radiation, etc.) via theport 124 when an exposure-tracking module 110 engages the port 124.Generally, the port 124 functions as a physical interface between anexposure-tracking module 110 and the garment 150; and the identificationmodule functions as a data or identification interface between theexposure-tracking module 110 and the garment 150.

In various implementations, the port 124 can include: a set ofmechanical snap buttons configured to transiently engage and retain anexposure-tracking module 110; a set of magnetic elements configured totransiently engage and retain ferro-magnetic elements in anexposure-tracking module 110; or a threaded element and locking featureconfigured to transiently mate with and lock to complementary featureson an exposure-tracking module 110. However, the port 124 can define anyother form or feature configured to transiently engage and retain anexposure-tracking module 110 against the garment 150.

In one example in which the garment 150 defines a cycling, football, orsoccer jersey, the port 124 can be arranged on the back of the jersey atthe base of the jersey's collar; when an exposure-tracking module 110 isattached to the port 124, the port 124 can thus locate theexposure-tracking module 110 near a user's neck, which may represent acommon high-Sun-exposure area for these sports such that incident solarradiation data collected by the exposure-tracking module 110 isrepresentative of the user's true Sun exposure. In a similar example inwhich the garment 150 defines a short-sleeved running jersey, the port124 can be arranged on the left (or right) sleeve of the jersey; when anexposure-tracking module 110 is attached to the port 124, the port 124can thus locate the exposure-tracking module 110 near a user's leftupper arm, which may represent a common high-Sun-exposure area forrunners such that incident solar radiation data collected by theexposure-tracking module 110 is representative of the user's true Sunexposure. In another example in which the garment 150 defines a skicoat, the port 124 can be arranged on a breast pocket of the ski coat;when an exposure-tracking module 110 is attached to the port 124, theport 124 can thus locate the exposure-tracking module 110 over a user'schest and near the user's face, which may represent the region of theuser's body most susceptible to ultraviolet exposure such that incidentsolar radiation data collected by the exposure-tracking module 110 isrepresentative of the user's true Sun exposure. However, the port 124can be arranged on or integrated into the garment 150 at any othergeneric, sport-relative, or activity-specific location.

The port 124 thus enables the garment 150 to be separated from anexposure-tracking module 110. To enable the same or otherexposure-tracking module 110 to pair incident solar radiation datacollected during a session with garment-related data that the softwareprogram can then merge into a precise (i.e., accurate and repeatable)estimation of a user's true ultraviolet exposure during the session, theidentification module can store identification information for thegarment 150; upon receipt of a query from an exposure-tracking module110 installed over the port 124, the identification module can returnthis identification to the exposure-tracking module 110 via the port124.

In one implementation, the identification module includes an ID chippreloaded with a substantially unique identifier or (“UUID”) and iselectrically coupled to a set of prongs, pads, or other electricalinterfaces in the port 124; when the exposure-tracking module 110 isconnected to the port 124, electrical connections in theexposure-tracking module 110 mate with the corresponding prongs, pads,or other electrical interfaces in the port 124 to enable theexposure-tracking module 110 to communicate with the identificationmodule. For example, the identification module can be connected to eachof a ground, power, and one data pin arranged in the port 124; whenconnected to the port 124 the exposure-tracking module 110 can groundthe ground pin, supply power to the power pin, and transmit and receivedata to and from the identification module over the data pin via I2Ccommunication protocol. Upon receipt of a unique ID from theidentification module, the exposure-tracking module 110 can pair solarradiation data collected during the current session with this unique IDand upload these data to a local computing device and/or to a remoteserver. The local computing device or remote server can then pass theunique ID through a name mapping system 100 to retrieve garment-relateddata and then process these incident ultraviolet radiation solarradiation data into an ultraviolet exposure level for the user, asdescribed below.

In another implementation, the identification module includes an ID chippreloaded with garment-related data. For example, the identificationmodule can be preloaded with: body areas covered by the garment 150(e.g., torso, upper arm, and/or lower arm); or a percentage of torso andupper limb skin area covered by the garment 150 (e.g., 55% for asleeveless jersey or 85% for a long-sleeved jersey). The identificationmodule can also be preloaded with body areas or body area proportionscovered by other items commonly worn with the garment 150, such as by ahelmet with the garment 150 defining a football jersey or cycling shortsand socks for the garment 150 defining a cycling jersey.) Theidentification module can also be loaded with a size of the garment 150(e.g., small, medium, or large, etc.); and the software program canestimate the user's total skin area based on the size of the garment 150and a predefined skin area model.

Furthermore, the identification module can also be preloaded with atotal solar rejection ratio or UV-A, UV-B, UV-C, visible light, and IRrejection ratios of the garment's material (e.g., 90%, 95%, or 98%),such as in the form of a UPF or SPF rating of the garment's material.

Additionally or alternatively, the identification module can bepreloaded with a solar reflectance value of a ground covering common toa sport or activity performed while wearing the garment 150, such as atotal solar reflectance value or UV-A, UV-B, and UV-C reflectance valuesof grass for the garment 150 that defines a soccer or football jersey,of asphalt for the garment 150 that defines a running or cycling jersey,or of snow for the garment 150 that defines a skiing coat. Theidentification module can thus serve these data to the exposure-trackingmodule 110 when the exposure-tracking module 110 is installed on thegarment 150 to enable the exposure-tracking module 110 to locallytransform incident solar radiation data into a total ultravioletexposure of the user. However, the identification module can bepreloaded with any other user- or garment-related data. Alternatively,the ID stored in the identification module can be linked to any of theforegoing data, such as in a remote database via a name mapping system,as described above.

1.4 Exposure-tracking module

As shown in FIG. 1, the exposure-tracking module 110: is configured totransiently couple to the port 124 via a jack 114; is configured to readthe identifier of the garment 150 from the identification module; andincludes a radiation sensor 116 configured to detect levels of incidentsolar radiation (e.g., IR, visible and/or ultra-violet light).Generally, the exposure-tracking module 110 defines an electronic modulethat can be transiently connected to one of any number of ID-enabledgarments to collect incident solar radiation data during a trainingsession.

In one implementation, the exposure tracking module includes: a housing112 configured to transiently attach to the port 124 on the garment 150;a jack 114 coupled to the housing 112 configured to transiently engage aport 124 on the garment 150; a radiation sensor 116 arranged in thehousing 112 and configured to detect solar radiation incident on thehousing 112; and a controller 130.

In the foregoing implementation, the exposure-tracking module 110includes: a housing 112, such as a plastic injection-molded and siliconeover-molded housing 112. The housing 112 can define an outer surface anda jack 114—opposite the outer surface—configured to engage (e.g., insertinto) the port 124 in an ID-enabled garment 150. For example, the jack114 can include a ferrous prong configured to mate with a complimentaryport 124 of the smart-garment 150. Similarly, the jack 114 can beconfigured to mate with the port 124 with a snap feature, a threadedfeature, or any other transient connection means. In thisimplementation, the housing 112 can include a seal configured to resistinflux of liquids, such as water, and protect internal components fromdamage. The exposure-tracking module 110 can also include a radiationsensor 116, such as a digital UV Index light sensor, adjacent anUV-transparent region of the outer surface of the housing 112.

In another implementation, the exposure-tracking module 110 can includelocal memory arranged in the housing 112; and a controller 130 arrangedin the housing 112 and configured to sample the radiation sensor 116, toread an identifier from an identification module in a connected garment150, and to store incident solar radiation data and the identifier tomemory. In this implementation, the exposure-tracking module 110 cansample solar radiation data from the radiation sensor 116 and store thesolar radiation data locally in the local memory.

Furthermore, the exposure-tracking module 110 can include a wirelesscommunication module arranged in the housing 112 and configured totransmit solar radiation data and the identifier to a local computingdevice, such as in real-time, intermittently (e.g., once per two-minuteinterval), or asynchronously (e.g., at the conclusion of a trainingsession); and a rechargeable battery arranged in the housing 112configured to power the controller 130 and the wireless communicationmodule.

Because the garment-related data is linked to the garment 150 or storedon the garment 150 itself (e.g., rather than stored on theexposure-tracking module 110), the exposure-tracking module 110 can beconnected to multiple ID-enabled garments over time while also enablingthe software program—which may execute locally on the exposure-trackingmodule 110, on a separate mobile computing device, or remotely at aremote server—to access both incident solar radiation data from theexposure-tracking module 110 and garment-related data that informstransformation of these incident solar radiation data into an accurateestimation of the user's ultraviolet exposure during a training session.For example, a user may own or be provided (e.g., by a team) oneexposure-tracking module 110 and multiple ID-enabled garments, such asone sleeveless, one short-sleeved, and one long-sleeved ID-enabledgarment 150, as shown in FIG. 2. The user can: connect theexposure-tracking module 110 to the sleeveless garment 150 and wear thesleeveless garment 150 during a hot-weather session; connect theexposure-tracking module 110 to the short-sleeved garment 150 and wearthe short-sleeved garment 150 during a warm-weather session; and connectthe exposure-tracking module 110 to the long-sleeved garment 150 andwear the long-sleeved garment 150 during a cold-weather session. Inthese examples, the exposure-tracking module 110 can access a unique IDfrom an identification module in the connected garment 150 and pair thisunique ID with incident solar radiation data collected during eachcorresponding session; by accessing garment-related data related tothese unique IDs, the software program can track the user's ultravioletexposure during each of these sessions, which may be a function of thegarment's material, the garment's coverage, and a ground covering nearthe user during each session. The user can then separate theexposure-tracking module 110 from a garment 150 in order to recharge thebattery within the exposure-tracking module 110, synchronize the modulewith a remote computer or device, update the module's firmwareprograming, and/or wash the garment 150.

The exposure-tracking module 110 can also include a motion sensor, suchas an accelerometer, a compass sensor, and/or a tilt sensor, and/ororientation sensor configured to read orientation data of theexposure-tracking module 110. In one implementation, the controller 130can thus transition from an inactive (e.g., “sleep” or “hibernate”) modeto an active mode responsive to an output of the motion sensor and/orpredict an activity of the user wearing the exposure-tracking module 110based on a magnitude and/or frequency of outputs of the motion sensor.Additionally or alternatively, the controller 130 can selectively—andopportunistically—read solar radiation values from the radiation sensor116 based on orientation of the exposure-tracking module 110. Forexample, the controller 130 can selectively sample the radiation sensor116 when the exposure-tracking module 110 aligns with a targetorientation of the exposure-tracking module 110 in which the radiationsensor 116 is directed in a particular direction, such as a direct,diffuse, and/or global direction as described in U.S. patent applicationSer. No. 15/648,158, which is herein incorporated in its entirety bythis reference.

Throughout operation (e.g., while in the active mode), the controller130 can regularly sample the radiation sensor 116, such as once perminute or at a rate of 0.1 Hz, timestamp these data, and immediatelytransmit these data to a local computing device or store these data inmemory for later transmission to the local computing device.

The exposure-tracking module 110 can additionally or alternativelyinclude an ambient temperature sensor, a skin temperature sensor, aheart rate sensor, a respiratory rate sensor, an IR irradiance sensor, avisible light irradiance sensor, a barometer, altimeter, and/or anyother ambient or biometric sensor; and the controller 130 can transitionfrom the inactive mode to the active mode and/or track biometric signalsof the user based on outputs of these sensors. For example, a user'sskin temperature may be proportional to both solar radiation exposureand ambient air temperature. Therefore, the software program can: trackambient air temperature through a temperature sensor integrated into theexposure-tracking module 110; and increase solar radiation exposurethreshold for the user as an inverse function of ambient airtemperature, and vice versa. Similarly, the software program can: trackthe user's skin temperature through a skin temperature sensor integratedinto the garment 150; and increase solar radiation exposure thresholdfor the user as an inverse function of ambient air temperature, and viceversa.

Therefore, the software program can predict athletic performance effectsbased any one or more of: solar radiation levels; solar radiationlevels; exposed skin area; skin temperature; ambient air temperatures;humidity; duration of exposure; and/or other biometric values (e.g.,heart rate, respiratory rate, etc.); etc. of the user and the user'senvironment and can serve real-time and/or asynchronous prompts to theuser accordingly. However, the exposure-tracking module 110 can be ofany other form and include any other active or passive components.

2. Method

As shown in FIG. 1, a method S100 for tracking and responding toultraviolet exposure includes: reading an identifier of a garment 150worn by a user in Block S110; estimating the skin exposure of a userwearing the garment 150 based on the identifier in Block S120; at afirst time, reading an solar radiation value from a radiation sensor 116transiently coupled to the garment 150 in Block S130; and, based on thesolar radiation value and the skin exposure, estimating an ultravioletexposure of the user at the first time in Block S140.

Generally, the controller 130 executing the software program isconfigured: to access a type of the garment 150 based on the identifierof the garment 150; to estimate levels of solar radiation exposure onthe user's skin based on the type of the garment 150 and levels ofincident solar radiation (e.g., ultra-violet light, visible light,infrared light, etc.) detected by the exposure tracking radiation sensor116 over time; and to serve a prompt to the user to reduce exposure inresponse to an estimated level of exposure on the user's skin exceedinga threshold. The software program can be implemented entirely or in partat the exposure-tracking module 110, at a native exposure-trackingapplication on the user's (or a coaches, etc.) mobile computing device,and/or at a remote server to transform garment-related data and incidentsolar radiation data collected by the exposure-tracking module 110during a training session into the user's solar radiation exposure andto notify the user (or the coach, etc.) of current or predictedover-exposure that may reduce the user's performance.

2.1 Garment Identifier

Block S110 of the method 5100 recites reading an identifier of a garment150 worn by a user in Block S100. Generally, the software program canaccess the identifier of the garment 150 (e.g., a unique ID), which caninclude specification of the type of garment 150, material, solarrejection ratio, etc., from the port 124 of the garment 150 via the jack114 coupled to the housing 112. The software program can query theidentification module of the garment 150 for the identifier and theidentifier module can transmit the identifier through the port 124 ofthe garment 150 and the jack 114 coupled and the housing 112 to thecontroller 130 of the exposure-tracking module 110.

In one implementation, upon receipt of the unique ID from theidentification module in the garment 150, the software program queries aname mapping system 100 (e.g., stored on the exposure-tracking module110, in a native exposure-tracking application executing on the user'scomputing device, or on a computer network) for garment-related data, asdescribed above.

2.2 Skin Exposure

Block S120 of the method S100 recites estimating the skin exposure of auser wearing the garment 150 based on the unique ID. Generally, thesoftware program can read the unique ID, retrieve a geometry and/orestimated skin coverage of the garment 150 based on the unique ID, andcalculate an amount (or proportion) of the user's skin exposed to solarradiation (i.e., and uncovered by the garment 150 and/or othercomplimentary garments).

In one implementation, the software program can read the unique ID ofthe garment 150 and query the NMS for geometry information of thegarment 150, such as size, shape (e.g., long-sleeved, short-sleeved,sleeveless), and/or estimated percentage of an average user's skincovered by the garment 150. Based on the geometry information, thesoftware program can estimate a proportion of the user's skin exposed tosunlight and a proportion of the user's skin covered by the garment 150.Alternatively, the software program can estimate an absolute skinsurface area exposed to sunlight and uncovered by the garment 150.

In another implementation, the software program can prompt the user toenter her height and weight through a user portal. Based on her heightand weight, the software program can calculate a total skin area of theuser. The software program can then access geometry data of thegarment—corresponding to the unique ID of the garment—and estimate theskin surface area covered by the garment when the user is wearing thegarment. Based on the total skin area of the user and the skin surfacearea covered by the garment, the software program can calculate the skinexposure as a difference between the total skin area and the skinsurface area covered by the garment.

In one variation, the software program can read the unique ID of thegarment 150 and query a lookup database for a (probable) set ofcomplementary garments likely worn by the user while wearing thesmart-garment 150. The software program can then estimate a skinexposure based on an estimated proportion of the user's skin exposed todirect Sunlight and uncovered by both the garment 150 and the set ofcomplementary garments. For example, the user may wear a smart cyclingjersey with the port 124 configured to accept the exposure-trackingmodule 110. In this example, while wearing the smart cycling jersey, theuser may wear a (non-smart) helmet, cycling shorts, cycling socks,and/or gloves. At a lookup database, the system 100 can store possible(and probable) combinations of clothing complementary to thesmart-garment 150 likely to be worn when wearing the smart-garment 150.Therefore, the software program can query the lookup database foradditional and complementary garments worn by the user while wearing thesmart-garment 150 and the lookup database can return the set ofcomplementary garments (e.g., helmet, cycling shorts, cycling socks,and/or gloves). Additionally or alternatively, the software program canquery a user to input complementary garments worn simultaneously withthe smart garment 150 and store this information for future reference.The software program can then access garment 150 information of thecomplementary garments (e.g., skin coverage information, geometry, orsolar rejection ratio) and adjust the skin exposure to account for allgarments worn by the user simultaneously.

However, the software program can calculate the skin exposure in anyother suitable way.

2.3 Solar Radiation Data

Block S130 of the method recites, at a first time, reading a solarradiation value from a radiation sensor 116 transiently coupled to thegarment 150. Generally, the controller 130 can sample the radiationsensor 116 regularly and/or intermittently to record solar radiationdata.

In one variation, the exposure-tracking module 110 can: read a sequenceof ultraviolet values from the ultraviolet sensor as theexposure-tracking module 110 sweeps through the orientation window, suchas at a rate of 10 Hz; and then store a singular maximum solar radiationvalue in this sequence of ultraviolet values as the solar radiationvalue for this sampling interval.

In another variation, in response to detecting alignment betweenorientation of the exposure-tracking module 110 and a target orientationat approximately the current time (or within a sampling intervalsucceeding the first time), the method S100 can be implemented to recorda first solar radiation value. The exposure-tracking module 110 can:regularly sample (e.g., at a rate of 10 Hz) orientation sensorsintegrated into the exposure-tracking module 110 to determine theorientation of the ultraviolet exposure-tracking module 110 relative toa reference frame; read an solar radiation value from the ultravioletsensor when alignment between the detected orientation of theexposure-tracking module 110 falls within a tolerance of a targetorientation (or within a target orientation window) calculated for thecurrent sampling interval; and then store this solar radiation value(e.g., an ultraviolet irradiance value in Watts per square meter) forthis sampling interval.

Similarly, the exposure-tracking module 110 can: read a sequence ofultraviolet values from the ultraviolet sensor as the exposure-trackingmodule 110 sweeps through the orientation window, such as at a rate of10 Hz; tag each solar radiation value in this sequence with anorientation of the exposure-tracking module 110 relative to thereference frame; and then store a singular solar radiation value in thissequence of ultraviolet values tagged with an orientation nearest atarget orientation as the solar radiation value for this samplinginterval.

Alternatively, the exposure-tracking module 110 can: record a firstsolar radiation value read from the ultraviolet sensor once theexposure-tracking module 110 enters an initial orientation window (e.g.,defined by a 15° cone axially aligned with a target orientation);recalculate a second, tighter orientation window (e.g., defined by a 10°cone axially aligned with a target orientation); replace the first solarradiation value with a second solar radiation value read from theultraviolet sensor once the exposure-tracking module 110 enters thesecond orientation window; recalculate a third, tighter orientationwindow (e.g., defined by a 5° cone axially aligned with a targetorientation); replace the second solar radiation value with a thirdsolar radiation value read from the ultraviolet sensor once theexposure-tracking module 110 enters the third orientation window; etc.during the sampling interval, thereby refining and increasing accuracyof an solar radiation value recorded for this sampling interval, asdescribed below.

2.3.1 Opportunistic Readings

In one variation of the method, the exposure-tracking module 110 canopportunistically record ultraviolet values when target conditionsdefined by the exposure-tracking module 110 are met, such as wheninadvertent movement of the exposure-tracking module 110 by the useraligns its integrated ultraviolet sensor to precalculated direct,diffuse, and/or global orientations, thereby reducing or eliminating aneed for the user to manually and intentionally orient theexposure-tracking module 110 in preparation for such readings, which mayotherwise frustrate the user, limit use of the exposure-tracking module110 over time, and reduce accuracy of the user's ultraviolet exposurecalculated by the exposure-tracking module 110 over time due to lowrepeatability and high degrees of error in manual positioning of theexposure-tracking module 110 by a user.

In one implementation, orientation sensors (e.g., a multi-axisgyroscope, compass, accelerometer, and/or tilt sensor) integrated intothe exposure-tracking module 110 can output yaw, pitch, and rollorientations of the light exposure device, such as relative to thereference frame of the Earth or relative to an arbitrarily-definedreference frame. For example, the exposure-tracking module 110 caninclude a compass sensor, a multi-axis tilt sensor or accelerometer, anda multi-axis gyroscopic sensor; and the exposure-tracking module 110 canfuse an absolute compass direction output by the compass, angularvelocity values output by the gyroscopic sensor, and acceleration valuesoutput by the tilt sensor or accelerometer into a pitch, yaw, and rollposition of the exposure-tracking module 110 relative an Earth referenceframe per sampling interval. From the solar position, theexposure-tracking module 110 can define a target direct orientation forthe light exposure device, such that, when outputs of these sensorsindicate that the exposure-tracking module 110 is aligned with thetarget direct orientation, an ultraviolet sensor integrated into theexposure-tracking module 110 is directed parallel to the incidentradiation from the Sun.

In particular, rather than prompting a user wearing (or carrying) theexposure-tracking module 110 to manually align the exposure-trackingmodule 110 with the target direct orientation during a samplinginterval, the exposure-tracking module 110 can: intermittently wake froma sleep state to collect ultraviolet data (e.g., once per fifteen-minuteinterval); define target direct, diffuse, and/or global orientations forcollection of ultraviolet values during this interval; regularly samplethe orientation sensors during this interval to monitor the orientationof the light exposure device; automatically record ultraviolet valuesfrom the ultraviolet sensor in response to the orientation of theexposure-tracking module 110 falling within a threshold difference fromeach of the target direct orientation, the target diffuse orientation,and/or the global orientation; transform these ultraviolet values intoan solar radiation exposure value for the user for this interval; andthen return to the sleep state. The exposure-tracking module 110 canrepeat this cycle over time, such as during known daylight hours for thecurrent date and location of the light exposure device, and aggregatesolar radiation exposure values for each interval during a single dayinto a cumulative solar radiation exposure value for the user for thisday.

For example, the user may rotate the exposure-tracking module 110 intothe target global orientation while opening a door or performing anyother task; in response to detecting that its orientation has fallenwithin a threshold difference of the target direct orientation (or arange of direct orientations) for the current time of day, date, andapproximate geolocation of the light exposure device, theexposure-tracking module 110 can record a global ultraviolet value. Theexposure-tracking module 110 can similarly record ultraviolet valueswhen the detected orientation of the exposure-tracking module 110 fallswithin threshold differences of the target direct and diffuseorientations. (However, the exposure-tracking module 110 canopportunistically collect ultraviolet data for other target orientationsof the exposure-tracking module 110 based on predicted positions of theSun relative to Earth at corresponding times of day, days of the year,and locations stored on the light exposure device.)

As shown in FIG. 2, the exposure-tracking module 110 can also include anambient light sensor configured to output a signal corresponding to alevel of incident ambient (visible) light and arranged proximal theultraviolet sensor in the light exposure device. For example, inresponse to lack of a signal from the ambient light sensor during knowndaylight hours at the current time and location of the light exposuredevice, the exposure-tracking module 110 can determine that the ambientlight sensor is obscured, such as by a sleeve covering a wrist on whichthe exposure-tracking module 110 is worn by a user. Because the ambientlight sensor is adjacent the ultraviolet sensor, obfuscation of theambient light sensor may indicate similar obstruction of the ultravioletsensor. Therefore, the exposure-tracking module 110 can postpone orcancel collection of ultraviolet data during a current sampling intervalwhile the ambient light sensor is obstructed, thereby avoidingrecordation of aberrant or irrelevant ultraviolet values when conditionssurrounding the ultraviolet sensor are unfavorable to collection ofaccurate sensor data.

In the foregoing example, the exposure-tracking module 110 can alsodetect presence of ambient light based on an output of the ambient lightsensor, confirm that the ambient light and ultraviolet sensors are notobscured, and then enable collection of ultraviolet data through theultraviolet sensor. (Similarly, the exposure-tracking module 110 canconcurrently sample the ambient light sensor and the ultraviolet sensorwhen the exposure-tracking module 110 aligns with a target orientationand then retroactively confirm that the ultraviolet sensor was notobscured during this sampling interval based on an ambient light levelread from the ambient light sensor during this same sampling interval.)However, in response to detecting the presence of ambient light butlittle or no solar radiation (e.g., UVB specifically, which maypenetrate fused silica and fused quartz but may not penetrate othercommon glasses), the exposure-tracking module 110 can determine that itis located indoors and estimate the user's solar radiation exposure atnull until an increase in detected incident solar radiation—indicatingthat the exposure-tracking module 110 is outdoors—is recorded.

Furthermore, the ambient light sensor can cooperate with the ultravioletsensor to prioritize target orientations for recording ultravioletvalues. For example, in response to detecting the presence of ambientlight, the exposure-tracking module 110 can record a direct solarradiation value in response to detecting its alignment with the targetdirect orientation, a diffuse solar radiation value in response todetecting its alignment with the target diffuse orientation, and aglobal solar radiation value in response to detecting its alignment withthe target global orientation. In this example, the exposure-trackingmodule 110 can determine that the direct solar radiation valuecorresponds to an ultraviolet index significantly less than ultravioletindices corresponding to the global and diffuse ultraviolet values.Thus, the exposure-tracking module 110 can determine that its locationis outside yet away from direct sunlight, such as in a shaded area orunder overcast skies, and can temporarily reject direct ultravioletvalues recorded by the ultraviolet sensor, thereby applying the directand diffuse ultraviolet values to calculate a current ultraviolet indexbased on shade or cloudy sky ultraviolet exposure models and algorithms.

Alternatively, the exposure-tracking module 110 can determine that theincident solar radiation value corresponds to cumulative erythemal doseincluding: a standard erythemal dose—defined as a erythemally-weightedUV irradiation—and a minimum erythemal dose—defined as an amount ofweighted UV irradiance that cause the user's skin to turn red (this isdifferent for every skin type).

2.4 Solar Radiation Exposure

Block S140 of the method recites, based on the solar radiation value andthe skin exposure, estimating an ultraviolet exposure of the user at thefirst time. Generally, the software program can calculate an approximateultraviolet exposure of the user that accounts for incident solarradiation as well as skin coverage by the garment 150.

Upon receipt of garment-related data, the software program can populatea parametric ultraviolet exposure model with: the skin exposure (e.g.,skin area coverage proportion for the garment 150); UV-A, UV-B, UV-C,visible, and IR light rejection ratios for the garment's material; skinarea coverage and UV-A, UV-B, UV-C, visible, and IR light rejectionratios for other clothing articles commonly worn with the garment 150(e.g., cycling shorts and a helmet with a cycling jersey, shorts with arunning jersey, etc.); a predefined correction factor for the locationof the port 124 on the garment 150 (e.g., “1.0” for the port 124 locatedat the base of the neck; “1.4” for the port 124 located at the loweredge of the flank of the garment 150; and/or an ambient reflectancevalue common to surfaces associated with the type of garment 150; etc.The software program can then: pass an incident solar radiationvalue—recorded by the exposure-tracking module 110—to calculate anultraviolet exposure value for the corresponding instant in time; andintegrate these ultraviolet exposure values over time based on a knownsampling rate or known time between sampling periods at theexposure-tracking module 110 to estimate a total ultraviolet exposure onthe user's skin during the current training session, such as inreal-time as the incident solar radiation data is collected by theexposure-tracking module 110. The software program can thus estimate atotal ultraviolet exposure on the user's skin; alternatively, thesoftware program can implement the foregoing methods and techniques toestimate a total ultraviolet exposure on the user's skin in each of theUV-A, UV-B, and UV-C bands.

In a similar implementation, the software program accesses a solarradiation curve for the user's location; retrieves an incident solarradiation value recorded by the exposure-tracking module 110; calculatesa position of the radiation sensor 116 relative to the Sun based on atime of day of recordation of the solar radiation value and a typicalposition of the radiation sensor 116 relative to the ground wheninstalled on the garment 150 and worn by the user (e.g., based on theposition of the port 124 on the garment 150 and the type of relatedactivity); and then calibrates the solar radiation curve based on theincident solar radiation value and the position of the radiation sensor116 relative to the Sun. The software program then integrates the solarradiation curve over a duration of time that the garment 150 is worn bythe user. The software program can also: recalibrate the solar radiationcurve upon receipt of a next solar radiation value from theexposure-tracking module 110 and based on a recordation time of thissolar radiation value; and integrate this revised solar radiation curveover time going forward until a subsequent solar radiation value isreceipt. The software program can repeat this process until conclusionof the current activity session in order to estimate a total ultravioletexposure on the user's skin.

In the foregoing implementation, the software program can also interfacewith the native ultraviolet exposure application to receive confirmationfrom the user that she has applied Sunscreen prior to and/or during thesession, the type of Sunscreen applied, and where the Sunscreen wasapplied. The software program can pass these data into the parametricultraviolet exposure model to compensate for Sunscreen applied by theuser and to thus further improve accuracy of the estimated totalultraviolet exposure of the user.

The software program can also access a generic threshold maximumultraviolet exposure or a threshold maximum ultraviolet exposureselected by the user (or a coach, etc.), such as through the nativeultraviolet exposure application executing on the user's computingdevice and stored in the user's (or a teams') account. Alternatively,the software program can access the user's total ultraviolet exposureand performance data collected automatically or entered manually by theuser (or by a coach, etc.) during previous sessions and can calculate athreshold maximum ultraviolet exposure—that accounts for the user'sestimated resilience to ultraviolet exposure (e.g., based on the user'sposition on a skin tone scale)—for the user's current session based onthese data. For example, the software program can select or calculate athreshold maximum ultraviolet exposure in the form of an irradiance(e.g., “Watt/m²”) value, dosage (e.g., “Joules/m²,” or irradianceintegrated over time), or energy (e.g., “Joules”) for each of UV-A,UV-B, and UV-C.

The software program can then trigger an alarm when the estimated totalultraviolet exposure on the user's skin exceeds the threshold maximumultraviolet exposure selected or calculated for the current session. Inone example in which the software program executes on theexposure-tracking module 110, the software program can trigger theexposure-tracking module 110 to activate an internal buzzer and/oractivate an integrated vibrator. The software program can additionallyor alternatively broadcast a notification to a paired mobile computingdevice (e.g., a smartphone or smartwatch associated with the user, acoach, etc.), such as a notification suggesting that the user seekimmediate shade, cease the current exercise, apply Sunscreen, or don anadditional layer of clothing, as described below.

The software program can also: calculate a trend (e.g., a parametrictime-based trendline, a time-series analysis generated with a predictivemodel) in the total ultraviolet exposure on the user's skin over time(e.g., since the beginning of the current session); extrapolate totalultraviolet exposure on the user's skin into the future based on thistrend; and compare this extrapolated trend to the threshold maximumultraviolet exposure for the current session to predict whether and whenthe user's total ultraviolet exposure will exceed the threshold maximumSun exposure. Thus, if the extrapolated trend suggests that the user'stotal exposure will exceed the threshold maximum ultraviolet exposurewithin a threshold period of time (e.g., within the next 20 minutes),before the scheduled conclusion of the current session, or before thepredicted conclusion of the current session (e.g., based on durations ofpast sessions by the user with the same garment 150 or other ID-enabledgarments of the same type), the software program can issue anotification through the user's mobile computing device or through theexposure-tracking module 110 in real-time to prompt the user to adjustthe current training session in order to limit her total Sun exposure,which may reduce the user's recovery time following the current session.

The software program can implement similar methods and techniques to:select or calculate a maximum ultraviolet exposure rate, such as in theform of an irradiance (e.g., “Watt/m²”) value; extract a rate ofultraviolet exposure from the trend in total ultraviolet exposure on theuser's skin; and prompt the user (or the coach, etc.) to adjust thecurrent training session in order to reduce her rate of ultravioletexposure if the current rate of ultraviolet exposure exceeds thethreshold ultraviolet exposure rate. For example, the software programcan prompt the user to apply Sunscreen, don an additional layer ofclothing, complete the current session indoors or in a shaded outdoorarea, or adjust the training schedule for a time when the solarirradiance is at a target level in order to extend the user's time toexhaustion as shown in FIGS. 5A and 5B.

The software program can implement the foregoing methods and techniquessubstantially in real time in order to provide the user (or the coach,etc.) with real-time feedback and guidance related to the user'sultraviolet exposure in order to extend the user's time to exhaustionand/or to reduce the user's recovery time following the current trainingsession. Alternatively, the software program can implement the foregoingmethods and techniques asynchronously—such as when the user downloadsdata from the exposure-tracking module 110 to her smartphone uponconclusion of the current training session—in order to inform the userwhen and how to adjust her future training sessions to reduce totalultraviolet exposure and ultraviolet exposure rate, which may extend theuser's time to exhaustion and/or reduce the user's recovery timefollowing future training sessions.

Therefore, the software program can collect or estimate any of thefollowing before, during, and/or after a training session: time, date,location, height, weight, skin type, age, proportion of skin exposed,solar radiation rejection (e.g., by Sunscreen and/or clothing), plannedor actual ultraviolet exposure time, planned or actual solar radiationexposure time, target vitamin D synthesis, and/or UV index, etc. for theuser. The software program can transform these data into: local Sunaltitude angle, local Sun azimuth angle, estimated UV index, UV indexcurve for a period of time (e.g., one day), time to Sunburn, time toreach vitamin D synthesis target, amount of synthesized vitamin D,minimum suggested exposed skin area % to reach vitamin D target (E.g.,before Sun burn), reduction in athletic endurance, etc. for the user.

However, the software program can process incident solar radiation(e.g., UV, visible, and/or IR light) data collected by theexposure-tracking module 110 and provide related guidance to the user(or to a coach, etc.) in any other way or according to any other schema.

2.5 Posture

In one variation, the software program can read the unique ID of thegarment and access a lookup table to predict a type of activityperformed by the user while wearing the garment 150. Based on the typeof activity, the software program can predict a posture (or bodyposition) of the user while wearing the garment 150. From this posture,the software program can estimate an orientation of the radiation sensor116 relative to a target orientation (e.g., direct, diffuse, or global).Furthermore, the software program can identify whether the radiationsensor 116 is obscured. For example, for an exposure-tracking module 110connected to a port 124 on a front side of a cycling jersey, thesoftware program can determine that the radiation sensor 116 is likelydirected downward and away from the Sun. Therefore, the software programcan selectively disable sampling of the radiation sensor 116.Additionally or alternatively, the software program can determine thatreadings from the radiation sensor 116 are likely diffuse solarradiation values and, as described above, adjust the diffuse solarradiation value according to the ultraviolet exposure model to define anoverall ultraviolet exposure. Therefore, based on a predicted posture ofthe user, the software program can estimate an orientation of theexposure-tracking module 110, calculate an orientation of the radiationsensor 116 relative to a direct orientation (i.e., directly toward theSun as predicted by a solar position model), and correct solar radiationvalues based on the known orientation of the radiation sensor 116.

Furthermore, as shown in FIG. 6, the software program can apply theposture to generate an solar radiation distribution model that describesdistribution of solar radiation over the user while the user is wearingthe garment 150 based on the posture. In the foregoing example, acyclist may experience greater solar radiation exposure at the back ofher neck than at the front of her neck, on her face, and/or on the backof her legs. The software program can access a solar position based on aSolar position model, which describes the location of the Sun in the skyat a particular time, date, and location. Based on the posture and thesolar position, the software program can predict shadows and solarradiation exposure over the cyclist's body, thereby defining anultraviolet distribution model. Based on this model, the softwareprogram can adjust the ultraviolet exposure to adjust for unevendistribution of ultraviolet exposure over the cyclist's body whilecycling.

3. Individual Users

In one variation shown in FIG. 3, the system 100 is implemented to tracka single user's (or athlete's) Sun exposure, prompt the user to adjusther training schedule in order to extend time to exhaustion and/orreduce recovery time following training sessions, and/or assist the userin planning upcoming training sessions to compensate for UV indexforecasts, etc. Generally, in this variation, the system 100 can collectunique ID from the garment and incident solar radiation data from theexposure-tracking module 110, transform these data into UV, IR, visiblelight, and/or total ultraviolet exposure values for the user, and thenprovide guidance to the user in real-time, after the training session,or before a next training session in order to provide quantitativemetrics enabling the user to affect her time to exhaustion and recoverytime by controlling her ultraviolet exposure over time.

3.1 Ambient Reflectance

In this variation, the system 100 can measure or predict the ambientreflectance of a surface around the user during a training session basedon one or more other sensor streams recorded at the exposure-trackingmodule 110. In one implementation, the exposure-tracking module 110further contains an accelerometer; during operation, the controller 130in the exposure-tracking module 110 samples the accelerometer,timestamps these acceleration data, and stores these acceleration datawith incident solar radiation data. Upon receipt of these data, thesoftware program can: identify the garment 150 as a cycling jersey basedon a unique ID received from the identification module; retrieve a setof ambient reflectance values for ground surfaces common to cycling(e.g., asphalt, dirt, grass), each paired with an acceleration model;match acceleration data received from the exposure-tracking module 110to one acceleration model; and then select a corresponding ambientreflectance value for the user during the current training session orsegment of the current training session. For example, if theseacceleration data exhibit relatively large-amplitude, regularoscillations, the software program can determine that the user ismountain biking and select an ambient reflectance model for dirtaccordingly; similarly, if these acceleration data exhibit relativelysmall-amplitude, irregular oscillations, the software program candetermine that the user is biking on a road surface and select anambient reflectance model for asphalt accordingly.

In another example, the software program can identify the garment 150 asa running jersey and retrieve a set of ambient reflectance values forground surfaces common to running (e.g., asphalt, dirt, grass, track),each paired with an acceleration model. If acceleration data receivedfrom the exposure-tracking module 110 indicates rapid accelerations andrapid motion over short periods of time, the software program candetermine that the user is sprinting on a track and select an ambientreflectance model for a red track surface accordingly; similarly, ifacceleration data received from the exposure-tracking module 110indicates lower-amplitude accelerations over a longer period of time,the software program can determine that the user is running on asphaltand select an ambient reflectance model for asphalt accordingly.

The software program can then implement the selected ambient reflectanceto predict the user's total Sun exposure, as described above. However,the software program can predict or determine surfaces near the userduring the training session according to any other sensor streamrecorded during operation of the exposure-tracking module 110.

3.2 Preloading Ambient Reflectance

In another implementation, the software program associates ambientreflectance values with various locations throughout a preplanned pathof an upcoming training session. For example, the user can access atraining planner within an instance of the native exposure-trackingapplication executing on her mobile computing device, as describedabove, access a map within the training planner, and then indicatewaypoints within the map to define a new training route (e.g., a runningpath or a bike route) within the user's account. Alternatively, thenative exposure-tracking application—executing on the user's smartphoneor smartwatch, etc. carried by the user during a training session—canrecord GPS waypoints as the user traverses (e.g., runs or cycles along)a training route and then automatically define a new training routewithin the user's account based on these GPS waypoints. Later, thenative exposure-tracking application can: prompt the user to name thenew training route and to indicate prominent ground surface types—suchas grass, asphalt, concrete, gravel, dirt, and/or track surface,etc.—along various segments of the training route; and then associateambient reflectance values with segments of the training route based onthese ground surface type labels provided by the user. Alternatively,the software program can automatically label segments of the trainingroute: by projecting the training route onto a color geographical map;extracting colors from the map adjacent segments of the training route;associating these colors with prominent ground surface types, such asbased on a lookup table; and then labeling segments of the trainingroute accordingly.

In preparation for a training session at a later time, the nativeexposure-tracking application—executing the software program on a mobilecomputing device carried by the user—can: prompt the user to select apredefined training route from a set of training routes stored in theuser's account; download location-based (e.g., GPS-tagged) ambientreflectance values for segments of the selected training route; and thenimplement the methods and techniques described above to estimate theuser's total ultraviolet exposure during the training session based onincident Solar radiation data received from the exposure-tracking module110 installed on a garment 150 worn by the user during the trainingsession and based on GPS locations of the mobile computing devicethroughout the training session. (The native exposure-trackingapplication can also implement similar methods and techniques inreal-time as the user traverses a new or known training route byreferencing GPS locations of the user's mobile computing device againsta color geographic map, as described above, or by referencing GPSlocations of the user's mobile computing device against a geographic maplabeled directly with local ambient reflectance values.) The nativeexposure-tracking application can thus calculate total ultravioletexposure of the user with great accuracy by implementing dynamic,location-based ambient reflectance values.

Alternatively, the software program can: compile ambient reflectancevalues along the training route into one composite ambient reflectance,such as by calculating an average of these ambient reflectance valuesweighted according to the real length of corresponding segments of thetraining route, and then associate these composite ambient reflectancevalues with the training route. The software program—executing withinthe native exposure-tracking application on a mobile computing devicecarried by the user during the training session or executing locally onthe exposure-tracking module 110—can then implement this compositeambient reflectance to calculate the user's total ultraviolet exposureduring the training session.

The software program can then selectively prompt the user to seekshelter from the Sun, apply Sunscreen, or return home, etc. in real-timeduring the training session according to exposure-related triggers, asdescribed above.

3.3 Predictive Ultraviolet Exposure Feedback

In another implementation, the software program can: access an averageUV index and solar irradiance level over the duration and at thelocation of a training route previously completed by the user; retrieveincident solar radiation and solar radiation data collected by theexposure-tracking module 110 during this previous training session;normalize these incident solar radiation data according to the averageUV index and solar irradiance levels during the previous session; andassociate these normalized incident solar radiation data within segmentsof the training route based on GPS data collected by the mobilecomputing device while the user traversed the training route. Thesoftware program can also calculate ambient reflectance coefficientsalong discrete segments of the training route based on relativemagnitudes of incident ambient light—normalized according to the averageUV index—detected by the exposure-tracking module 110. In thisimplementation, these normalized incident solar radiation values mayreflect true ambient reflectance, shade (e.g., from trees), and otherfactors affecting ultraviolet exposure along segments of the trainingroute. (The software program can implement similar methods andtechniques to normalize incident solar radiation data according to UVindices at discrete locations along the training route in order tofurther improve accuracy of the user's total ultraviolet exposure duringlater training sessions along the same training route.)

In this implementation, in preparation for a next training session, theuser can access the native exposure-tracking application (e.g.,executing on her mobile computing device) to indicate a training routefor a next training session, such as by selecting from a drop-down menuof preplanned paths previously defined by the user or recorded duringprevious training sessions, and to enter a scheduled time for the nexttraining session, as shown in FIG. 3. The native exposure-trackingapplication can then: access a forecast UV index at or near the locationof the selected training route at a time of the next training session;multiply normalized incident solar radiation values stored with the pathby the current UV index to predict incident solar radiation levels atthese locations along the selected training route; estimate the user'stotal incident solar radiation during the next training session byintegrating these predicted incident solar radiation levels along thelength or estimated time of the training session; and then correct theuser's total incident solar radiation according to the type (e.g., bodycoverage afforded by) and the material of a garment 150 commonly worn bythe user during such training sessions in order to the predict theuser's total ultraviolet exposure over the course of training session.

In this implementation, if the user's predicted total ultravioletexposure exceeds a first threshold corresponding to reduced performance(or Sunburn, etc.), the native exposure-tracking application can: promptthe user to apply Sunscreen of a particular SPF level predicted toreduce the user's predicted total ultraviolet exposure to below thefirst threshold; and/or prompt the user to wear an alternate garment150, such as a long-sleeved jersey rather than a short-sleeved jersey orto wear a visor, during the next training session in order to reduce theuser's predicted total ultraviolet exposure to below the firstthreshold.

However, if the user's predicted total ultraviolet exposure exceeds asecond threshold (greater than the first threshold) corresponding to atotal ultraviolet exposure that cannot be compensated for with Sunscreenor a reasonable change in clothing, the native exposure-trackingapplication can prompt the user to wait until later in the day or thenext morning, when the UV index has decreased, to begin the trainingsession. Alternatively, the native exposure-tracking application canprompt the user to select an alternate training route exhibiting greatershade—as indicated by normalized incident solar radiation values—for thenext training session, such as if the user has indicated that she willbegin the next training session soon or immediately. For example, thenative exposure-tracking application can: implement the foregoingprocess to calculate a total ultraviolet exposure for each othertraining route defined in the user's account; and identify a second path(e.g., of a shorter length, extending across more grassy areas, oraffording more shade) for which the user's predicted total ultravioletexposure is reduced below the first and/or second thresholds; and promptthe user to traverse this second training route rather than the routeinitially selected.

In a similar implementation, the user indicates her preferred timewindow for completing an upcoming training session through the nativeexposure-tracking application; the software program—executing within thenative exposure-tracking application—can implement the foregoingprocesses to suggest one or a set of predefined training routes that theuser can complete within the time window while limiting her totalultraviolet exposure to less than the first and/or second threshold Sunexposures. Similarly, the user can select a training route within thenative exposure-tracking application and the software program canimplement the foregoing processes to calculate a soonest time the usercan begin this next training session while limiting her totalultraviolet exposure to less than the first and/or second threshold Sunexposures, such as given apparel and a Sunscreen type also suggested bythe native app or indicated by the user.

The system 100 (e.g., the garment 150, the exposure-tracking module 110,the software program, and/or the native exposure-tracking application,etc.) can also cooperate to track the user's total ultraviolet exposurethroughout a training session and to selectively serve prompts to theuser substantially in real-time to control her total ultravioletexposure to levels that yield extended time to exhaustion and reducerecovery time. The system 100 can additionally or alternatively servethese prompts and related data to the user asynchronously (e.g., uponconclusion of a training session) in order to teach the user tools fortracking and managing her ultraviolet exposure throughout trainingsessions.

The foregoing methods and techniques can be similarly implemented inconjunction with other sports—such as golf, skiing, and horsebackriding—and/or on behalf of players on a team.

3.4 Route Adaptation

In one variation, the software program can aggregate training routesacross multiple users, store temporal and spatial solar radiation values(ultraviolet, visible and IR) with each training route based on exposuredata collected from users traversing these training routes, and sharethese training routes and ultraviolet exposure values with the sameand/or other users. By aggregating exposure readings along a route andapplying an algorithm to compare these aggregated readings to expectedand forecast solar radiation levels a predictive exposure map may becreated for the specific route and for any given date and time, showingportions of a route that are highly exposed (e.g. along a hilltop) aswell as portions that are shaded (e.g. through a wooded park). Forexample, the software program can enable users (near these routes) toview and select from their own or other training routes based onassociated ultraviolet exposure indices. The software program cantherefore network users and training routes across users based on solarradiation exposure data. For example, the software program can promptthe user to enter a target ultraviolet exposure level per trainingsession, per day, per week, per month, etc., or the software program canrecommend such a target ultraviolet exposure level to the user. Thesoftware program can then suggest or automatically select a trainingroute—from a set of training routes specific to the user or a set oftraining routes nearby aggregated from multiple users—for the user basedon this target ultraviolet exposure level.

3.5 Examples

In one example, the user may attach the exposure module to a garment 150by mating a jack of the exposure module to a port integrated into thegarment. The software program can then determine that the exposuremodule is currently attached to the garment and, therefore, worn by auser. The controller can then ping (or otherwise wirelessly transmitconfirmation to) a mobile computing device to confirm that the exposuremodule is attached to the garment. The mobile computing device canrender a user portal (e.g., within a native application and/or window).The software program can then populate the user portal with thegarment's unique ID. The software program can then query a NMS and/orother database to identify a type of activity performed by the user whenwearing the garment corresponding to the garment's unique ID (e.g., acycling jersey). Based on the type of activity, the software program canaccess a set of historical cycling routes ridden by the user in thepast. Based on historical ultraviolet values recorded by the radiationsensor along the set of historical routes, the software program cancalculate current erythemal indices at discrete points along each routein the set of historical routes. From these ultraviolet indices, thetype of garment, estimated ground reflectance, average duration of theroute in the past, etc., the software program can calculate an estimatedcumulative ultraviolet exposure for each route in the set of historicalroutes of the user. Based on the estimated cumulative ultravioletexposure, the software program can select a particular route or set ofroutes over which the estimated cumulative ultraviolet exposure fallsbelow a threshold ultraviolet exposure. The software program can thenrender a suggestion to take the particular route (or set of routes) tothe user within the native application. The user may then opt to takethe particular route or elect an alternative route.

In a similar manner, the user may select a route based on predictedroute-specific effects on athletic endurance. For example one user mayselect a route that is heavily shaded to minimize the reduction in hisendurance due to solar radiation exposure in order to improve themusculoskeletal and cardiovascular benefits of the training sessionwithout becoming exhausted prematurely. Alternately, a second user mayselect an exposed route with high levels of solar radiation exposure tocondition herself and improve her endurance and ability to compete insunny conditions.

4. Team Sports

In one variation shown in FIG. 4, the system 100 is implemented inconjunction with an outdoor team sport, such as football, soccer, orbaseball, in order to enable a coach (or an athletic director, atrainer, etc.) to track solar radiation exposure across players on theteam, adjust a practice schedule in real-time in order to extend time toexhaustion and/or reduce recovery time for players on the team, and/oradjust an upcoming practice schedule to compensate for UV index andsolar irradiation forecasts, etc.

4.1 Garment and Exposure-Tracking Module Distribution

In this variation, each player on the team can be provided withID-enabled garments. For each garment 150, a unique ID encoded into theidentification module in the garment 150 can be associated with oneplayer on the team, such as in a name mapping system, to enableultraviolet exposure of each player to be separately tracked. Eachplayer can then “check out” one exposure-tracking module 110 prior to apractice session or competition. Alternatively, each player can bepermanently assigned one exposure-tracking module 110, and a unique IDencoded into the exposure-tracking module 110 can be uniquely assignedto a corresponding player in the name mapping system.

4.2 Ultraviolet Exposure Limits

In this variation, generic threshold maximum ultraviolet exposure (e.g.,“solar radiation dose”) or generic threshold maximum ultravioletexposure rates (e.g., “solar radiation dose rate”) can be assigned toall players on the team. Alternatively, the coach (or trainer, etc.affiliated with the team) can assign custom threshold maximum Sunexposures and/or custom threshold maximum ultraviolet exposure rates toselect players or groups of players, such as through a coaching portalaccessible through a web browser. For example, the coach can assign alow maximum ultraviolet exposure rate to a quarterback on the (football)team, a low maximum ultraviolet exposure rate to a player recoveringfrom an illness, a moderate maximum ultraviolet exposure rate to aplayer recovering from an injury, and a high maximum ultravioletexposure rate to the kicker on the team. The coach can similarlyassign—and the software program can implement—maximum ultravioletexposure thresholds based on whether a player is scheduled to play in anupcoming game or whether a player is scheduled to start or close in theupcoming game.

Furthermore, in preparation for an upcoming competition in a locationwith an high forecast UV index and/or solar irradiance levels, thesoftware program can guide the coach in increasing generic or custommaximum Sun exposures and maximum ultraviolet exposure rates for playerson the team during practice sessions prior to the competition, therebyenabling these players to acclimate to greater ultraviolet exposurelevels during practice sessions leading up to the upcoming competition;the software program can thus modify triggers for servingexposure-related notifications to the coach based on these updatedmaximum Sun exposures and maximum ultraviolet exposure rates for theteam. For example, the coach can enter a practice schedule and a gameschedule—including times of day and locations—of the team's upcomingcompetitions through the coaching portal, and the software program can:retrieve forecast UV index and solar irradiation data at the times andlocations of upcoming practices and competitions; predict totalultraviolet exposure of groups of players on the team during a nextcompetition based on its corresponding forecast UV index and solarirradiance and the length of the competition; automatically calculatemaximum Sun exposures and maximum ultraviolet exposure rates for theteam for each upcoming practice before the next competition based onforecast UV indices and solar irradiances during upcoming practices inorder to gradually acclimate players to predicted Sun exposures andultraviolet exposure rates during the competition; and then prompt thecoach to confirm these maximum Sun exposures and ultraviolet exposurerates. During upcoming competitions, the software program can serveexposure-related prompts to the coach according to these Sun exposuresand ultraviolet exposure rates, as described below.

4.3 Real-time Guidance

In one implementation shown in FIG. 3, a hub placed on a field or mobilecomputing device (e.g., a tablet or a smartphone) carried by a coach orassistant: collects unique ID and incident solar radiation data fromexposure-tracking modules installed on garments worn by players during apractice session; and then uploads these data to a remote serverexecuting the software program. The software program can implement theforegoing methods and techniques to track individual ultravioletexposure levels and ultraviolet exposure rates of players on the teamthroughout the practice session and can selectively return prompts tothe coach or assistant, such as through the mobile computing device orother local computing device, to control ultraviolet exposure of certainplayers based on their assigned maximum Sun exposures or maximumultraviolet exposure rates for the practice session. For example, thesoftware program can prompt the coach to: provide Sunscreen to aparticular player; move the particular player to a shaded area of afield; shift the particular player to indoor training exercises; benchthe particular player; or send the particular player to a trainingfacility during or after the practice session for recovery assistance;etc. if the particular player's total Sun exposure, predicted future Sunexposure, or ultraviolet exposure rate exceeds assigned levels. Thesoftware program can prompt the coach to similarly handle groups ofplayers on the team exhibiting similar total Sun exposures, predictedfuture Sun exposures, or ultraviolet exposure rates.

The software program can additionally or alternatively notify trainingstaff of Sun over-exposure of a player on the team in order to guide thetraining staff in assisting the particular's player recovery followingthe practice session. Similarly, for a particular player who has beenexposed to too much Sun or has been exposed to Sun at more than aprescribed threshold rate during a previous practice session, thesoftware program can prompt the coach (or assistant, etc.) to assign anindoor activity (e.g., weight lifting) or a lower-intensity activity(e.g., skills training) to the particular player or to bench theparticular player during a next practice session in order to allow theplayer to fully recover from this over-exposure.

The software program can implement similar methods and techniques duringa competition, such as to guide the coach in predicting performance ofplayers later in the competition and to guide the coach in substitutingplayers to compensate for sun (over)exposure. The software program canalso store these ultraviolet exposure and ultraviolet exposure rate datain a database, such as paired with a measured or forecast UV index atthe time and location of the practice session or competition.

4.4 Cooperation of Multiple Sensors

Additionally or alternatively, the exposure-tracking module 110 cancooperate with other exposure-tracking modules worn at other locationsof the athlete's body, worn by other athletes within an athletic team,arranged on or near a practice field during a training session, etc. Forexample, a first athlete of an athletic team may wear a firstexposure-tracking module 110 integrated into a watch or wristband; asecond athlete on the athletic team may wear a second exposure-trackingmodule 110 coupled to a jersey; and a third athlete on the athletic teammay not wear an exposure-tracking module 110. Furthermore, a trainer forthe athletic team may arrange a third exposure-tracking module 110 on ornear a practice field such that when the athletic team practices on thepractice field, the third exposure-tracking module 110 near the practicefield can detect and estimate solar radiation exposure for all athleteson the practice field. In this example, the first, the second, and thethird exposure-tracking modules can cooperate to estimate solarradiation exposure levels for the third athlete and other athletes ofthe athletic team who may not wear an exposure-tracking module 110during a practice session. Furthermore, in this example, the first, thesecond, and the third exposure-tracking modules can cooperate toidentify and correct outlier solar irradiance values in order to improveaccuracy of solar radiation exposure data by increasing the quantity ofsolar radiation exposure data streams.

4.5 Practice Planning

In another implementation, the software program: accesses a forecast UVindex and/or solar radiation level during a time and at a location of anupcoming practice session; predicts an ultraviolet exposure of playerson the team during the upcoming practice session based on this forecastUV index, historical player ultraviolet exposure data, and historical UVindex data; and serves guidance to the coach (or assistant, trainer,etc.) in adjusting a training schedule for the team based on theultraviolet exposure predictions. For example, the software program can:predict a delay to the start of the next practice session that willreduce Sun over-exposure to less than a threshold proportion (e.g., 15%)of the team; and serve a prompt to the coach to delay the next practicesession to later in the same day—when the forecast UV index islower—accordingly.

In another example, the software program can predict Sun over-exposurein at least a threshold proportion (e.g., 25%) of the team during anafternoon practice session based on a forecast UV index and solarirradiance at the time and location of the afternoon practice session;and then prompt the coach to shift a conditioning-centric workout fromthe upcoming afternoon practice session to a proactive session scheduledfor the next morning (i.e., when the forecast UV index is lower) and toshift a skills-centric workout from the next morning practice session tothe upcoming afternoon practice session if slicing mechanism predictsthat more than a threshold proportion of the team (e.g., 15%) willexperience Sun over-exposure during the next afternoon session based onthe forecast UV index for the same time and location. In anotherexample, the software program can estimate a duration of the nextscheduled practice session that limits predicted Sun over-exposure toless than a threshold proportion (e.g., 15%) of the team and prompt thecoach to limit the length of the next scheduled practice to thisduration. The software program can thus prompt the coach to adjust,delay, or reschedule conditioning-centric outdoor workouts to timesand/or days for which lower UV indices are forecast, thereby enablingthe coach to push players to their true exhaustion rather than to apremature exhaustion predicated on over-exposure to Sunlight (e.g.,excess skin temperature resulting from excess Sun exposure) such thatthe players' true endurances improve as a result of theseconditioning-centric practice sessions.

For example, the system 100 can transmit a prompt to the user portal torender a change in training times for a particular athlete, such asrecommending that the particular athlete train outdoors from 10 am-12 pminstead of 8 am-10 am over the following four days. Based on the changein training times, the system 100 can also estimate solar radiationexposure from 10 am-12 pm over the following four days (e.g., fromweather information and past solar radiation exposure models) toanticipate a solar radiation exposure.

The software program can additionally or alternatively estimate adifference in predicted performance of all or select athletes on theteam given a current practice schedule and a suggested practice scheduleor adjustment (e.g., a “25% to 35% reduction in endurance during theupcoming training session”) and provide these data to the coach in orderto assist the coach in deciding whether to adjust the current practiceschedule.

Additionally or alternatively, the system 100 can transmit a command toa computing device, such as a smartphone, to render within a user portala prompt, alert, message, or other notification. As described below, thesystem 100 can tailor the prompt to the stake-holder accessing a userportal rendered by the computing device.

In one implementation, the system 100 can transmit the command torender, within the user portal accessed by a coach of an athletic teamincluding athletes wearing the exposure-tracking module 110, promptspertaining to how the coach may adjust the training for the athlete toavoid injury and over-exposure to solar radiation (UV, visible and/orIR). In this implementation, the user portal can render a list of everyathlete on the athletic team's roster, each athlete's current solarradiation exposure, and classification of each athlete's current solarradiation exposure.

Furthermore, the user portal can identify (e.g., highlight or rendernear a top of the user portal) athletes with excessive (or high)ultraviolet exposures, for example. The user portal can then render analert recommending the coach remove athletes with excessive ultravioletexposures from play, activities that increase injury risk, and suspendstrenuous training activities for a window of time until the athlete isable to recover from overexposure to solar radiation. Likewise, the userportal can render a list of activities appropriate for an athlete basedon the athlete's current solar radiation exposure. For example, for afirst athlete with current solar radiation exposure exceeding asufficient level, the user portal can render a list of activitiesincluding: tackle football, springboard gymnastics, anaerobic training(or “sprinting”), weight-lifting, and aerobic running.

In response to detecting the current ultraviolet exposure remainingbelow the threshold ultraviolet exposure, the system 100 can transmit acommand to render a prompt in the user portal to suspend strenuousathletic activity, such as weight-lifting, anaerobic exercise, highimpact training, and long-duration aerobic exercise for a period ofdiminished activity. Furthermore, the user portal can render a list ofactivities for the athlete to perform during the period of diminishedactivity to decrease ultraviolet exposure and, therefore, decrease theathlete's risk of Sun damage.

In another implementation, the system 100 can transmit the command torender, within the user portal accessed by an athletic trainer orphysician of a team of athletes wearing the exposure-tracking module110, prompts indicating each athlete's current ultraviolet exposure,classification of the current ultraviolet exposure, and, based on theclassification of the current ultraviolet exposure, a plan to maintainor decrease ultraviolet exposures. Generally, in this implementation,the user portal can render prompts relating to each athlete within anathletic team and targeted toward an athletic trainer with an interestin maintaining each athlete's well-being and performance capacity. Thus,the user portal can render suggestions for training modifications foreach athlete recommended to decrease ultraviolet exposure.

In particular, the user portal can render a list of athletes orderedaccording to descending ultraviolet exposures over a period of time,such as hours, or days, or weeks or months. Thus, the user portal canhighlight athletes with high risk for injury due to low ultravioletexposures so that the trainer and/or physician can devote more time tohelping athletes with high risk for injury from training sessions andavoid disadvantageous training exercises. For example, the user portalcan render a list of athletes likely to need an ice bath after practiceto cool their muscles from overheating due to excessive ultravioletexposure

However, the system 100 can transmit any other prompts, alerts, goals,data, or messages to the user portal in any other suitable way.

However, the software program can provide any other guidance to thecoach, coach's assistant, or trainer, etc. affiliated with the team inorder to reduce, limit, or control ultraviolet exposure in players onthe team based on garment-related data, incident solar radiation datacollected from garments worn by team members, and/or forecast UV indicesand solar radiation for any other sport or team.

The systems and methods described herein can be embodied and/orimplemented at least in part as a machine configured to receive acomputer-readable medium storing computer-readable instructions. Theinstructions can be executed by computer-executable componentsintegrated with the application, applet, host, server, network, website,communication service, communication interface,hardware/firmware/software elements of a user computer or mobile device,wristband, smartphone, or any suitable combination thereof. Othersystems and methods of the embodiment can be embodied and/or implementedat least in part as a machine configured to receive a computer-readablemedium storing computer-readable instructions. The instructions can beexecuted by computer-executable components integrated bycomputer-executable components integrated with apparatuses and networksof the type described above. The computer-readable medium can be storedon any suitable computer readable media such as RAMs, ROMs, flashmemory, EEPROMs, optical devices (CD or DVD), hard drives, floppydrives, or any suitable device. The computer-executable component can bea processor but any suitable dedicated hardware device can(alternatively or additionally) execute the instructions.

As a person skilled in the art will recognize from the previous detaileddescription and from the figures and claims, modifications and changescan be made to the embodiments of the invention without departing fromthe scope of this invention as defined in the following claims.

The invention claimed is:
 1. A system for tracking and responding to Sunexposure comprising: a housing configured to transiently attach to aport on a first garment; a jack coupled to the housing configured totransiently engage a port on the first garment; a radiation sensorarranged in the housing and configured to detect solar radiationincident on the housing; and a controller configured to: read anidentifier of the first garment from the port via the jack; based on theidentifier, estimate a skin exposure of a user wearing the firstgarment; read a solar radiation value from the radiation sensor at afirst time; and based on the solar radiation value and the skinexposure, estimate a solar radiation exposure of the user at the firsttime.
 2. The system of claim 1, further comprising: a wirelesscommunication module arranged in the housing and configured to broadcastthe solar radiation exposure to a mobile computing device; and a nativeapplication configured to execute on the mobile computing device and torender the solar radiation exposure.
 3. The system of claim 2, whereinthe controller is configured to serve a prompt to the native applicationin response to the solar radiation exposure exceeding a threshold solarradiation exposure, the user exhibiting skin damage in response to thesolar radiation exposure exceeding the threshold solar radiationexposure.
 4. The system of claim 1: wherein the housing is configured totransiently attached to a second garment; wherein the jack is configuredto transiently engage a second port on the second garment; and whereinthe controller is configured to read a second identifier of the secondgarment from the second port via the jack.
 5. The system of claim 1:further comprising an orientation sensor arranged within the housing andconfigured to detect an orientation of the housing; and wherein thecontroller is configured to: read the orientation of the housing; andestimate a geospatial location and orientation of the radiation sensorbased on the orientation of the housing and the identifier of the firstgarment.
 6. The system of claim 1, wherein the controller is configuredto: access a solar rejection ratio value of the first garmentrepresenting rejection of solar radiation through the first garment tothe user's skin; and adjust the solar radiation exposure based on thesolar rejection ratio of the first garment.
 7. The system of claim 1,wherein the controller is configured to: based on the identifier, accessa set of complementary garments worn by the user at the first time; andestimate the skin exposure based on an estimated proportion of theuser's skin exposed to direct Sunlight and uncovered by the firstgarment and the set of complementary garments.
 8. The system of claim 1,wherein the controller is configured to: estimate an erythemal doseincident at the user's skin at the first time; calculate a cumulativeerythemal dose for the user over a time window based on the erythemaldose and prior erythemal doses recorded over the time window precedingthe first time; and in response to the cumulative erythemal doseexceeding a threshold erythemal dose, serving a prompt to the user toavoid additional solar radiation exposure.
 9. A method for tracking andresponding to Sun exposure comprising: reading an identifier of a firstgarment worn by a user; estimating the skin exposure of a user wearingthe first garment based on the identifier; at a first time, reading asolar radiation value from a radiation sensor transiently coupled to thefirst garment; and based on the solar radiation value and the skinexposure, estimating a solar radiation exposure of the user at the firsttime.
 10. The method of claim 9, further comprising: calculating anerythemal dose incident on the user's skin at the first time based onthe solar radiation value; calculating a cumulative erythemal dose forthe user over a time window preceding the first time by integrating theerythemal dose and prior erythemal doses, recorded during the timewindow, over the time window.
 11. A method of claim 9, furthercomprising: based on the identifier, extracting a type of activityperformed by the user at the first time; estimating a posture of theuser at the first time based on the type of activity; based on theposture and a known location of the radiation sensor on the firstgarment, estimating an orientation of the radiation sensor at the firsttime; and adjusting the solar radiation exposure based on theorientation of the radiation sensor relative to a known position of theSun at the first time.
 12. The method of claim 9: further comprising:based on the identifier, extracting a type of activity performed by theuser at the first time; estimating a posture of the user at the firsttime based on the type of activity; based on the posture and a knownlocation of the radiation sensor on the first garment, estimating anorientation of the radiation sensor at the first time; calculating atarget orientation of the radiation sensor based on a geospatiallocation of the first garment at the first time and a solar positionmodel; wherein reading the solar radiation value comprises, in responseto detecting alignment between the radiation sensor and the targetorientation, reading the solar radiation value.
 13. The method of claim9: further comprising predicting a set of complementary garments worn bythe user in addition to the first garment at the first time based on theidentifier of the first garment; wherein estimating the skin exposurecomprises estimating the skin exposure as a proportion of the user'sskin exposed to direct Sunlight and uncovered by the first garment andthe set of complementary garments at the first time.
 14. The method ofclaim 9: further comprising accessing a solar rejection ratio of thefirst garment representing rejection of solar radiation through thefirst garment to the user's skin; and wherein estimating the solarradiation exposure comprises: calculating a direct solar radiationexposure based on the skin exposure and the solar radiation value;calculating an indirect solar radiation exposure based on a proportionof the user's skin covered by the first garment, the solar rejectionratio of the first garment and the solar radiation value; and combiningthe direct and indirect solar radiation value to define the solarradiation exposure.
 15. The method of claim 9, further comprisingserving a prompt to a mobile computing device affiliated with the userto reduce exposure to Sunlight in response to the solar radiationexposure exceeding a threshold exposure.
 16. The method of claim 9:wherein reading the identifier of the first garment comprises, at a portarranged on the first garment worn by a first athlete of a team,accessing a type of garment worn by the first athlete based on theidentifier of the first garment; further comprising: predicting a typeof a second garment worn by a second athlete of the team based on thetype of the first garment worn by the first athlete of the team; andestimating a second solar radiation exposure of the second athlete atthe first time based on the type of the second garment and the solarradiation exposure of the first athlete at the first time.
 17. Themethod of claim 16, further comprising serving a prompt to a computingdevice affiliated with a coach of the first athlete and the secondathlete to reduce Sun exposure in response to the solar radiationexposure on the athlete's skin exceeding a threshold solar radiationexposure.
 18. The method of claim 17: further comprising: accessinghistorical solar radiation exposure data over a time window precedingthe first time; calculating a cumulative solar radiation exposure overthe time window by integrating the historical solar radiation exposuredata over the time window; wherein serving the prompt to a computingdevice affiliated with the coach comprises serving the prompt to reduceSun exposure in response to the cumulative solar radiation exposureexceeding the threshold solar radiation exposure.
 19. The method ofclaim 9, further comprising: accessing a current time and date;accessing a geospatial location of the user at the current time; basedon the identifier, predicting a type of activity performed by the userat the current time; based on the geospatial location, the type ofactivity, the current date and time, and historical activity data forthe type of activity, accessing a route of the user over a time windowsucceeding the current time; predicting solar positions at discretelocations on the route based on a solar position model; estimating solarradiation incident on the user at discrete locations along the route;predicting cumulative solar radiation exposure to the user over the timewindow on the route; serving the cumulative solar radiation exposurepredicted for the route to a mobile computing device affiliated with theuser; and in response to the cumulative solar radiation exposurepredicted for the route exceeding a threshold solar radiation exposure,prompting the user to select an alternative route.
 20. The method ofclaim 19: further comprising: accessing a set of historical routespreviously executed by the user; predicting a solar position at thefirst time at discrete locations on each route in the set of historicalroutes based on the Solar position model defining an solar radiationmodel representing solar radiation values at discrete locations alongeach route in the set of historical routes; predicting a cumulativesolar radiation exposure to the user over the time window on each routein the set of historical routes; selecting a particular route in the setof historical routes with a cumulative solar radiation exposure lessthan the threshold solar radiation exposure; and wherein prompting theuser to select an alternative route comprises serving the particularroute to the user.